Field Evaluation of Sethoxydim as a Postemergence Herbicide for Gramineous Weeds
Journal of pesticide science
Sethoxydim ((+)-2-(1-ethoxyiminobutyl)-5- [2-(ethylthio)propyl]-3-hydroxycyclohex-2-enone} was evaluated as a postemergence herbicide for gramineous weeds in field trials. Sethoxydim showed excellent herbicidal activities to gramineous weeds at the rate of 0.3kg/ ha and excellent selectivities to broadleaved crops. Tank-mixture with mineral oil improved its activities without crop injury, and application of 0. 2 kg/ha of sethoxydim with 3 liter/ha mineral oil was as effective as that of
... as that of 0.3kg/ha of sethoxydim. Annual bluegrass (Poa annua) and broadleaved weeds were resistant in spite of mixing with mineral oil. Broadleaved crops showed satisfactory tolerance, but gramineous crops except red fescue (Festuca rubra) were very sensitive, as well as gramineous weeds, to sethoxydim. Sethoxydim gave good efficacy in foliar application, but its efficacy was poor in practical preemergence treatment. The short persistence in soil seemed to be one of the factors contributing to low activity in preemergence treatment. It was indicated that crops including gramineous crops could be sown beyond 21 days after treatment of sethoxydim. Stable efficacy was obtained in low water volume application and rainfall immediately after application did not reduce its efficacy. As the lack of efficacy on broadleaved weeds were shown, tank-mixtures or sequential treatments with broadleaved herbicides in soybean or sugar beet field were conducted. Adequate control on both grasses and broadleaved weeds was achieved by this combination of methods.